EP2905062B1 - Exhaust gas processing apparatus - Google Patents

Exhaust gas processing apparatus Download PDF

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Publication number
EP2905062B1
EP2905062B1 EP13864088.3A EP13864088A EP2905062B1 EP 2905062 B1 EP2905062 B1 EP 2905062B1 EP 13864088 A EP13864088 A EP 13864088A EP 2905062 B1 EP2905062 B1 EP 2905062B1
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EP
European Patent Office
Prior art keywords
spray
spray nozzles
main body
absorbing tower
liquid
Prior art date
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EP13864088.3A
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German (de)
English (en)
French (fr)
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EP2905062A4 (en
EP2905062A1 (en
Inventor
Kuniyuki Takahashi
Tadashi Komatsu
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Fuji Electric Co Ltd
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Fuji Electric Co Ltd
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Publication of EP2905062A4 publication Critical patent/EP2905062A4/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/79—Injecting reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/507—Sulfur oxides by treating the gases with other liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B05B1/20—Arrangements of several outlets along elongated bodies, e.g. perforated pipes or troughs, e.g. spray booms; Outlet elements therefor
    • B05B1/202—Arrangements of several outlets along elongated bodies, e.g. perforated pipes or troughs, e.g. spray booms; Outlet elements therefor comprising inserted outlet elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
    • B05B1/3405—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl
    • B05B1/341—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/04—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2247/00—Details relating to the separation of dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D2247/10—Means for removing the washing fluid dispersed in the gas or vapours
    • B01D2247/101—Means for removing the washing fluid dispersed in the gas or vapours using a cyclone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/30—Alkali metal compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/10—Inorganic absorbents
    • B01D2252/103—Water
    • B01D2252/1035—Sea water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/302—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/404—Nitrogen oxides other than dinitrogen oxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/06—Spray cleaning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/04—Sulfur or sulfur oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/02—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for marine vessels or naval applications
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to an exhaust gas processing apparatus for removing harmful substances (principally, sulfur oxides (SO x )) from exhaust gas.
  • harmful substances principally, sulfur oxides (SO x )
  • An exhaust gas processing apparatus using a cyclone scrubber is known as a removal apparatus for removing SO X from exhaust gas (see, for example, Patent Document 1).
  • the exhaust smoke desulfurization apparatus described in Patent Document 1 brings the gas that revolves up from the bottom of a cylindrical tower, into contact with liquid sprayed in the radial direction of the tower from spray nozzles installed at suitable intervals apart on a spray pipe installed vertically on the central axis of the tower, and absorbs or collects dirt.
  • the spray nozzles are disposed so as to be directed in the same direction of rotation as the gas flow (rotating flow) which rises up while rotating from the bottom of the absorbing column, and are arranged so as to have an inclination with respect to the horizontal plane in order to spray the absorbing liquid upwards with respect to the horizontal direction.
  • the spray mist emitted from the spray nozzles is sprayed in a substantially conical shape from a horizontal direction to an upward direction, for example.
  • Patent Document 1 Japanese Patent No. 3073972 [0004a] US 2008/174032 A1 describes a hazardous substance removing apparatus that comprises a bath in which a liquid collecting agent collecting a hazardous substance in gaseous form is stored, a suction tower of a cylindrical or almost cylindrical shape, which suctions the hazardous substance in gaseous form from a top opening of the tower itself, blends the hazardous substance with the collecting agent injected from a plurality of nozzles arranged inside the tower itself, and sends the blend to the bath via a bottom opening of the tower itself, an emission tower which is open into the bath via a bottom opening of the tower itself, and can make emission via a top opening of the tower itself, and a pump which pumps up the collecting agent within the bath.
  • the plurality of nozzles are arranged to make the collecting agent injected from the nozzles form a flow along an inner wall.
  • JP 2012 192361 describes( Figs. 6-7 ) an absorber with a gas inlet (39) at a perimeter of the absorber to cause a revolving upward gas flow along the absorber perimeter (32), a central pipe (35) for absorbent supply to branch pipes (37), each equipped with a single spray head (38) directing inwardly in an acute angle.
  • spray nozzles 102 are connected to a branch pipe 101 of the spray pipe 100 via an elbow having a bend section of 90 degrees, and therefore the spray nozzles 102 are disposed perpendicularly with respect to the branch pipe 101.
  • the spray angle is 120 degrees at the broadest, the absorbing liquid is not sprayed in at least 30 degrees of the central direction.
  • the distance between the circumferential wall of the branch pipe 101 on the extending direction side, and the spray port of the spray nozzle 102 is short, then the distance of flight of the absorbing liquid sprayed in this portion is also short.
  • the removal rate when removing harmful substances in the exhaust gas by a cyclone scrubber is correlated to the contact properties between the exhaust gas and the absorbing liquid (principally, the contact surface area and the contact time). Consequently, sufficient contact surface area is not achieved when the droplets of the absorbing liquid sprayed from the spray nozzles are not dispersed in a broad range, and furthermore, sufficient contact time is not achieved when the flight distance is short, and hence there is a problem in that a high removal rate cannot be obtained. In this case, in order to obtain a desired removal rate, it is necessary to ensure contact properties by increasing the number of spray nozzles, and increase in the size of the cyclone scrubber cannot be avoided.
  • the present invention was devised in view of these circumstances, an object thereof being to provide an exhaust gas processing apparatus whereby the removal rate of harmful substances can be improved and compact size can be achieved.
  • the present invention relates to an exhaust gas processing apparatus for absorbing gas by creating contact between gas and liquid as defined by independent claim 1.
  • the apparatus includes: an absorbing tower main body in which an internal space is formed; spray apparatus which sprays liquid in a prescribed region of the internal space; and a gas supply apparatus which introducing gas into the absorbing tower main body, wherein the spray apparatus has: a trunk pipe extending in the up/down direction in a prescribed region of the internal space; branch pipes coupled to the trunk pipe and extending towards an inner wall of the absorbing tower main body; and spray nozzles spraying liquid supplied from the branch pipes; and the spray nozzles are installed such that an angle formed between the center line of the spray region of the spray nozzles and the lengthwise direction of the branch pipes is an acute angle.
  • the spray nozzles are installed in such a manner that the angle formed between the center line of the spraying region of the spray nozzles and the lengthwise direction of the branch pipes is an acute angle, then it is possible to lengthen the distance between the perimeter wall section of the absorbing tower main body and the spray ports of the spray nozzles. Therefore, it is possible to increase the contact surface area between the exhaust gas and the absorbing liquid, since the droplets are sprayed in a broad range including the central portion, in the horizontal cross-section of the absorbing tower main body. Furthermore, by lengthening the distance between the perimeter wall section of the absorbing tower main body and the spray ports of the spray nozzles, the flight distance of the droplets is extended, and the contact time between the exhaust gas and the absorbing liquid can be increased.
  • the contact properties between the exhaust gas and the absorbing liquid (principally, the contact surface area and the contact time) can be raised, and therefore the efficiency of the removal of harmful substrates by each spray nozzle is raised, and the number of spray nozzles that need to be provided in order to achieve the desired removal rate in the gas processing apparatus is reduced. Since the number of branch pipes that need to be installed on the trunk pipe becomes lower, as the number of installed spray nozzles is reduced, then it is possible to shorten the trunk pipe. Consequently, it is possible to restrict the height of the absorbing tower main body for accommodating the water conduit pipe, and therefore it is possible to make the accommodating tower main body compact in size.
  • the spray nozzles have an angle of installation by which the trunk pipe is not included within the spraying region.
  • a plurality of the spray nozzles may be provided on each branch pipe, and the angle of installation of at least one of the spray nozzles may be an acute angle.
  • the angle of installation, with respect to the branch pipe, of the spray nozzle provided on the outer side in the radial direction may be smaller than the angle of installation of the spray nozzle provided in the inner side in the radial direction.
  • the spray nozzle may be a hollow cone nozzle. Beneficial Effects of the Invention.
  • the removal rate of harmful substances is improved and a compact size can be achieved, in an exhaust gas processing apparatus.
  • Fig. 1 is a schematic drawing showing an exhaust gas processing system centered on a gas absorbing tower which forms an exhaust gas processing apparatus relating to the present embodiment.
  • the exhaust gas processing system relating to the present embodiment contemplates a system which removes sulfur dioxide (SO 2 ) included in exhaust gas emitted from an engine which is used in a ship.
  • SO 2 sulfur dioxide
  • the invention is not limited to this, however, and the exhaust gas processing system relating to the present embodiment can be applied to processing of various exhaust gases including substances such as nitrogen oxide, sulfur oxide, and the like.
  • the exhaust gas processing system is principally composed by a gas absorbing tower 10 which receives a supply of exhaust gas from the engine 20, a seawater pump unit 30 provided with a seawater pressurization pump and a seawater suction pump, a wastewater tank 40, and a filter unit 50 for filtering the wastewater.
  • the exhaust gas emitted from the engine 20 is introduced into the gas absorbing tower 10.
  • This exhaust gas contains 50 to 1500 ppm of sulfur dioxide (SO 2 ).
  • SO 2 sulfur dioxide
  • the seawater sprayed inside the gas absorbing tower 10 drops down under gravity along the inner circumferential surface of the gas absorbing tower 10, and collects in a collecting section below the gas absorbing tower 10.
  • the collected seawater is expelled to the wastewater tank 40 via the wastewater pump unit 30, and is then filtered by the filter unit 50 and discharged into the sea.
  • FIG. 2A is an upper surface schematic drawing of the gas absorbing tower 10 relating to the present embodiment
  • Fig. 2B is cross-sectional schematic drawing of the gas absorbing tower 10.
  • the gas absorbing tower 10 is provided with: an absorbing tower main body 11 in which an internal space is formed in the up/down direction; a spray apparatus 12 which sprays liquid in the form of a mist in a prescribed region, in the up/down direction, of the internal space of the absorbing tower main body 11; a gas supply apparatus 13 which introduces gas into the absorbing tower main body 11 from a position below the region where the spray apparatus 12 sprays liquid; liquid return members 14 which are provided in a position above the region where the spray apparatus 12 sprays liquid, which projects in a ring shape towards the central axis from the inner wall surface of the absorbing tower main body 11, and of which at least the front end on the central axis side is bent back downwards; and a baffle 15 which is provided at a position below the spray apparatus 12.
  • the spray apparatus 12 is connected to the seawater pump unit 30 shown in Fig. 1
  • the gas supply apparatus 13 is connected to the engine 20 shown in Fig. 1 .
  • the absorbing tower main body 11 is constituted by a round cylindrical perimeter wall section 11a and a circular bottom wall section 11b.
  • the perimeter wall section 11a is formed with the same diameter in all parts.
  • the upper end portion of the perimeter wall section 11a is open and an opening section 11c is formed therein.
  • the absorbing tower main body 11 has a round cylindrical shape, but the shape of the absorbing tower main body 11 is not limited to this and may be a square cylinder shape, for example.
  • the spray apparatus 12 is disposed on the central axis of the absorbing tower main body 11.
  • the spray apparatus 12 is constituted by a water supply pipe 12a which is inserted inside the absorbing tower main body 11 from outside the absorbing tower main body 11 and which extends to a central position of the absorbing tower main body 11, a water conduit pipe 12b forming a trunk pipe which is coupled to the inserted end portion of the water supply pipe 12a and extends to a prescribed region, in the up/down direction, of the internal space of the absorbing tower main body 11, branch pipes 12c which are coupled to the water conduit pipe 12b and extend toward the perimeter wall section 11a of the absorbing tower main body 11, and spray nozzles 12d which are provided respectively at the front end of the each branch pipes 12c and which spray liquid supplied from the branch pipes 12c in a prescribed region.
  • these spray nozzles 12d are each installed in such a manner that an acute angle is formed between the center line of the spray region of the spray nozzle 12d, and the lengthwise direction of the branch pipe
  • the branch pipes 12c which are disposed in a plurality of levels in the up/down direction are arranged so that branch pipes 12c that are mutually adjacent in the up/down direction intersect with each other.
  • the arrangement of the branch pipes 12c with respect to the water conduit pipe 12b is not limited to this; for example, a composition may be adopted in which four branch pipes 12c are arranged at 90 degree intervals apart on the same perimeter portion of the water conduit pipe 12b.
  • the material of the spray nozzles 12d is desirably an austenite type stainless steel material, in order to obtain corrosion resistance when seawater is used as the absorbing liquid.
  • the gas supply apparatus 13 is provided in such a manner that the gas output direction is aligned with the tangential direction of the perimeter wall section 11a of the absorbing tower main body 11. Consequently, the exhaust gas introduced from the gas supply apparatus 13 is sprayed in a horizontal direction along the inner.circumferential surface of the perimeter wall section 11a.
  • the liquid return members 14 each have a bend-back surface section 14a which projects in a ring shape towards the central axis from the perimeter wall section 11a of the absorbing tower main body 11, a bend-back piece 14b which is bent back downwards from the front end of the central axis side of the bend-back surface section 14a, a liquid reservoir wall 14d which projects to the upper side from the front end of the bend-back surface section 14a so as to create a liquid reservoir section 14c, and a through hole 14e which allows the liquid collected in the liquid reservoir section 14c to drop down.
  • This opening section 14g is composed so as to have an internal diameter of approximately 5 to 8 tenths that of the opening section 11c of the absorbing tower main body 11.
  • the baffle 15 is constituted by a circular disk section 15a, and leg sections 15b which couple the circular disk section 15a with the perimeter wall section 11a of the absorbing tower main body 11.
  • a gap for liquid droplets to flow through is formed between the outer circumferential portion of the circular disk section 15a and the perimeter wall section 11a of the absorbing tower main body 11.
  • the baffle 15 divides the interior of the absorbing tower main body 11 into a region where liquid is sprayed by the spray apparatus 12 and a region where liquid is collected for drainage to the outside of the absorbing tower main body 11.
  • a wastewater pipe 16 for discharging liquid to outside the absorbing tower main body 11 is provided below the baffle 15.
  • seawater is introduced into the water conduit pipe 12b via the water supply pipe 12a.
  • the seawater is then sprayed towards the perimeter wall section 11a of the absorbing tower main body 11, from the spray nozzles 12d which are provided on the plurality of levels of branch pipes 12c.
  • the exhaust gas which rises up while revolving inside the absorbing tower main body 11 makes gas/liquid contact with the seawater sprayed from the spray nozzles 12d provided on the branch pipes 12c which are provided in the respective levels, and the sulfur dioxide in the exhaust gas is absorbed and removed.
  • the exhaust gas from which the sulfur dioxide has been removed is discharged into the atmosphere from the opening section 11c provided in the upper portion of the absorbing tower main body 11.
  • the seawater which forms into liquid droplets is pressed against the perimeter wall section 11a by the centrifugal force of the revolving flow and falls under its own weight. However, a portion of the seawater rises up through the interior of the absorbing tower main body 11 due to the rising and revolving flow.
  • the gas flow rate is 0 m/s or a value to close to same, and since the gas flow rate is faster in the vicinity of the perimeter wall section 11a than in the central portion, the seawater rises up along the perimeter wall section 11a due to the centrifugal force.
  • the seawater which rises up along the perimeter wall section 11a is impeded from rising further by the lowermost liquid return member 14, and collects on the lower surface of the bend-back surface section 14a and the periphery of the bend-back piece 14b. When the collected liquid exceeds a certain amount, the liquid forms droplets and drops down under its own weight.
  • the gas flow rate is faster in the vicinity of the perimeter wall section 11a of the absorbing tower main body 11 than in the central portion of the absorbing tower main body 11, and therefore when the through hole 14e is provided in the vicinity of the perimeter wall section 11a, a situation may arise in which the droplets do not drop down from the through hole 14e due to the effects of the upward flow. Therefore, by providing the through hole 14e at a position distanced from the perimeter wall section 11a where the gas flow rate is faster than in the vicinity of the perimeter wall section 11a, the effects of the upward flow are weaker and it is possible to make the droplets drop down via the through hole 14e.
  • liquid return members 14 are provided in a plurality of levels in the up/down direction, the rising up of seawater is impeded a plurality of times by the liquid return members 14. Therefore, it is possible to effectively prevent situations where the seawater rises up and flows out from the opening section 11c of the absorbing tower main body 11.
  • liquid return members 14 are installed on the absorbing tower main body 11, since the liquid return members 14 have a shape which projects in a ring shape towards the central axis from the perimeter wall section 11a of the absorbing tower main body 11 and an opening section 14g is formed on the side of the central axis, then it is possible to reduce the pressure loss caused by the installation of the liquid return members 14. Furthermore, no blockages occur due to the liquid return members 14, and complex maintenance is not necessary.
  • the droplets that drop down are prevented from revolving by the baffle 15 which is disposed below the absorbing tower main body 11, and then pass along the baffle 15 and the perimeter wall section 11a, and collect in the collecting section which is constituted by the bottom wall section 11b and the perimeter wall section 11a peripheral to same, of the absorbing tower main body 11.
  • the collected liquid is discharged to the outside of the absorbing tower main body 11 via the wastewater pipe 16.
  • Fig. 3 and Fig. 4 are illustrative diagrams which show a relationship between the branch pipes 12c of the spray apparatus 12 in the gas absorbing tower 10 and the spray nozzles 12d. Furthermore, Fig. 3 and Fig. 4 represent the spray region of the spray nozzles 12d by single-dotted lines.
  • the spray nozzles 12d are installed such that the spray direction is inclined inwards with respect to the branch pipes 12c, in the same plane as the branch pipes 12c. More specifically, as shown in Fig. 3B , the spray nozzles 12d are installed in such a manner that the angle ⁇ formed between the extension line of the center line of the spray region of the spray nozzles 12d, and the lengthwise direction of the branch pipes 12c, is an acute angle.
  • the angle ⁇ is desirably set to be one half of the spray angle of the spray nozzles 12d, in such a manner that the droplets sprayed from the spray nozzles 12d do not strike the water conduit pipe 12b. This is in order to prevent deterioration of the water conduit pipe 12b that occurs when the droplets sprayed from the spray nozzles 12d strike the water conduit pipe 12b.
  • the angle ⁇ is set to 45 degrees
  • the angle ⁇ is set to 60 degrees.
  • the spray nozzles 12d By arranging the spray nozzles 12d in this way so as to have an acute angle of installation ⁇ , it is possible to lengthen the distance between the perimeter wall section 11a of the absorbing tower main body 11 and the spray ports of the spray nozzles 12d. Consequently, as shown in Fig. 3A , droplets are sprayed in a broad range including the central portion, in the horizontal cross-section of the absorbing tower main body 11. Therefore, it is possible to raise the contact surface area between the exhaust gas and the absorbing liquid, compared to a case where the spray nozzles 12d are disposed perpendicularly with respect to the branch pipes 12c (see Fig. 10 ).
  • the spray nozzles 12d are arranged perpendicularly with respect to branch pipes 12c. Accordingly, the flight distance of the liquid droplets sprayed in this portion becomes longer, and hence the contact time between the exhaust gas and the absorbing liquid can be increased.
  • a spray nozzle 12d1 and a spray nozzle 12d2 are provided respectively at the front end and near the center of each of the branch pipes 12c.
  • the spray nozzle 12d1 and the spray nozzle 12d2 may each have the same angle of installation ⁇ ( ⁇ 1, ⁇ 2) with respect to the branch pipe 12c, or may have different angles of installation.
  • angles of installation ⁇ of the plurality of spray nozzles 12d may be adjusted, as appropriate.
  • the angle of installation ⁇ of at least one spray nozzle 12d, of the plurality of spray nozzles 12d is an acute angle
  • the angle of installation ⁇ of the remaining spray nozzle 12d may be equal to or greater than 90 degrees.
  • the angles of installation ⁇ ( ⁇ 1, ⁇ 2) of the two spray nozzles 12d1, 12d2 are desirably adjusted in such a manner that the angle ⁇ 1 formed between the line of extension of the center line of the spray region of the spray nozzle 12d1 and the lengthwise direction of the branch pipe 12c, and the angle ⁇ 2 formed between the line of extension of the center line of the spray region of the spray nozzle 12d1 and the lengthwise direction of the branch pipe 12c are both acute angles, and that ⁇ 1 ⁇ ⁇ 2.
  • the spray nozzles 12d can be connected to the branch pipe 12c by joints such as elbow or straight elbow joints, which are common pipe junctions.
  • joints such as elbow or straight elbow joints, which are common pipe junctions.
  • long nipples are used as the branch pipes 12c, elbows are screwed into either end thereof, straight elbows are screwed into these elbows, and spray nozzles 12d having a straight shape are provided on these straight elbows.
  • the spray nozzles 12d have a 90-degree bend section, it is also possible to connect the spray nozzles 12d directly to the elbows, without using the straight elbows.
  • a straight-shaped spray nozzle having any one of various spray patterns, such as a fan-shaped, full cone, or hollow cone pattern, for example, as the spray nozzle 12d.
  • a spray nozzle 12d of this kind it is also possible to adjust the angle of inclination with respect the horizontal plane, as well as the angle of installation within the horizontal plane.
  • By adjusting the angle of inclination of the spray nozzles 12d it is possible to cause the sprayed droplets to be directed upwards or downwards with respect to the horizontal plane. Consequently, the flight distance of the sprayed droplets is increased and the removal rate of the harmful substances is improved.
  • the flight distance in this case indicates the distance travelled by the droplets sprayed from the spray ports of the spray nozzles 12d until reaching the perimeter wall section 11a of the absorbing tower main body 11.
  • the gas absorbing tower 10 When the gas absorbing tower 10 is employed as an exhaust gas processing apparatus in a ship, the absorbing tower main body 11 must be compact in size and the installation space thereof must be small. In order to make the absorbing tower main body 11 compact in size, it is necessary to improve the removal rate of harmful substances.
  • the discharge pressure declines as the flow rate of the absorbing liquid decreases, the absorbing liquid forms a liquid film at the spray port, and there is a risk that droplets will not be formed.
  • the spray nozzles 12d use hollow cone nozzles 120 such as those shown in Fig. 5.
  • Fig. 5 is a cross-sectional schematic drawing showing an example of a hollow cone nozzle 120.
  • the hollow cone nozzle 120 is composed by a nozzle main body 121 and a cap 122.
  • the nozzle main body 121 includes an inflow hole 121a into which the absorbing liquid flows, and a revolving flow chamber 121b which is connected in substantially perpendicular fashion to the inflow hole 121a.
  • a spray port 122a is provided in the cap 122.
  • the absorbing liquid supplied from the inflow hole 121a to the revolving flow chamber 121b creates a revolving flow which revolves about the axis of the revolving flow chamber 121b. Consequently, an air core 123 is produced about the axis of the revolving flow chamber 121b, and the absorbing liquid sprayed from the spray port 122a forms a hollow cone shape.
  • the air core 123 is situated inside the hollow cone nozzle 120, then the diameter passing foreign matter is structurally larger than with a fan-shaped nozzle or a full cone nozzle. Therefore, by using a hollow cone nozzle 120 for the spray nozzles 12d, it is possible to prevent blockages of the spray nozzles 12d caused by foreign substance in the seawater or alkali liquid, which is used as the absorbing liquid. Consequently, when a composition which filters the absorbing liquid with a strainer is adopted, in order to prevent blockage of foreign substance in the spray nozzles 12d, it is possible to adopt a coarser mesh for the strainer, and the pressure loss can be reduced and the maintenance frequency can also be reduced.
  • the method for increasing the surface area of the droplets may be: (1) a method which increases the flow rate of absorbing liquid supplied to the supply nozzles 12d; (2) a method which reduces the diameter of the droplets sprayed from the spray nozzles 12d; or (3) a method which lengthens the flight time of the droplets sprayed from the spray port of the spray nozzles 12d to the perimeter wall section 11a; or the like.
  • the flow rate of the absorbing liquid is determined by the flow rate of harmful substances (SO X ) supplied to inside the absorbing tower main body 11.
  • the absorbing liquid flow rate is determined by applying a uniform safety ratio to the equivalent chemical amount required to absorb the SO X .
  • the safety ratio is no less than 1.01 and no more than 1.5, and desirably, 1.2.
  • the hollow cone nozzle yields the smallest diameter of the sprayed droplets, compared to the fan-shaped nozzle and the full cone nozzle. Consequently, by using a hollow cone nozzle for the spray nozzles 12d, it is possible to reduce the diameter of the droplets sprayed from the spray nozzles 12d, in other words, it is possible to increase the surface area of the droplets and hence to raise the removal rate of harmful substances.
  • the flight distance of the droplets can be lengthened by adjusting the angle of inclination of the spray nozzles 12d in such a manner that the sprayed droplets are directed upwards or downwards with respect to the horizontal surface.
  • the spray nozzles 12d are installed in such a manner that the angle of inclination ⁇ formed between the center line of the spray region of the spray nozzles 12d and the branch pipes 12c in the lengthwise direction of the branch pipes 12c is an acute angle, then the distance between the perimeter wall section 11a of the absorbing tower main body 11 and the spray port of the spray nozzles 12d can be lengthened. Therefore, it is possible to increase the contact surface area between the exhaust gas and the absorbing liquid, since the droplets are sprayed in a broad range including the central portion, in the horizontal cross-section of the absorbing tower main body 11. Furthermore, by lengthening the distance between the perimeter wall section 11a of the absorbing tower main body 11 and the spray ports of the spray nozzles 12d, the flight distance of the droplets is extended, and the contact time between the exhaust gas and the absorbing liquid can be increased.
  • the contact properties between the exhaust gas and the absorbing liquid (principally, the contact surface area and the contact time) can be raised, and therefore the efficiency of the removal of harmful substrates by each spray nozzle 12d is increased, and the number of spray nozzles 12d that need to be provided in order to achieve the desired removal rate in the gas absorbing tower 10 is reduced. Since the number of branch pipes 12c that need to be installed on the water conduit pipe 12b (trunk pipe) is also reduced in accordance with the reduction in the number of installed spray nozzles 12d, then the length of the water conduit pipe 12b can also be shortened. Consequently, it is possible to restrict the height of the absorbing tower main body 11 required to accommodate the water conduit pipe 12b, and therefore it is possible to make the accommodating tower main body 11 compact in size.
  • the height of the absorbing tower main body 11 is restricted and it is possible to dispose the gas absorbing tower 10 in the engine room or the deck of the ship, and therefore the installation properties of the gas absorbing tower 10 acting as an exhaust gas processing apparatus is improved.
  • the vertical axis represents the SO 2 removal rate (%) and the horizontal axis represents the gas flow rate (m/s).
  • the graph (X) shows the target line of the SO 2 removal rate.
  • Fig. 6 shows a graph for a case where branch pipes are provided at a pitch of 90 mm on the water conduit pipe, and 64 spray nozzles are provided. Furthermore, seawater is supplied as an absorbing liquid at a rate of 190 liters per minute to the spray nozzles in graph (A), and seawater is supplied as an absorbing liquid at a rate of 180 liters per minute to the spray nozzles in graph (B).
  • Fig. 7A is a graph showing the relationship between the diameter passing foreign substance in the spray nozzles and the mean particle size of the droplets
  • Fig. 7B is a graph showing the relationship between the diameter passing foreign substance in the spray nozzles and the flow rate per spray nozzle at a spray pressure of 0.3 MPa.
  • the vertical axis represents the mean particle size ( ⁇ m) and the horizontal axis represents the diameter passing foreign substance (mm).
  • the vertical axis represents the flow rate (L/min) and the horizontal axis represents the diameter passing foreign substance (mm).
  • the graph (D1) represents a case where a fan-shaped nozzle is used for the spray nozzles
  • the graph (E1) represents a case where a full cone nozzle is used for the spray nozzles
  • the graph (F1) represents a case where a hollow cone nozzle is used for the spray nozzles.
  • the graph (D2) represents a case where a fan-shaped nozzle is used for the spray nozzles
  • the graph (E2) represents a case where a full cone nozzle is used for the spray nozzles
  • the graph (F2) represents a case where a hollow cone nozzle is used for the spray nozzles.
  • Fig. 7A it can be seen that, at the same mean particle size, the diameter passing foreign substance is largest in the case of the hollow cone nozzle and therefore this form has the lowest risk of blocking of the nozzle.
  • Fig. 7B it can be seen that, at the same flow rate conditions, the diameter passing foreign substance is largest in the case of the hollow cone nozzle and therefore this form has the lowest risk of blocking of the nozzle.
  • Fig. 8 is a graph showing a relationship between the spray pressure of the spray nozzle and the mean particle size of the droplets.
  • the vertical axis represents the Sauter mean particle size d 32 ( ⁇ m) and the horizontal axis represents the spray pressure P (MPa).
  • the graph (G) represents a case where a fan-shaped nozzle is used for the spray nozzles
  • the graph (H) represents a case where a full cone nozzle is used for the spray nozzles
  • the graph (I) represents a case where a hollow cone nozzle is used for the spray nozzles.
  • Fig. 9 is a graph showing a relationship between the type of the spray nozzle and the SO X removal rate.
  • the vertical axis represents the SO X removal rate (%) and the horizontal axis represents the gas flow rate (m/s).
  • the graph (J) represents a case where a fan-shaped nozzle is used for the spray nozzles
  • the graph (K) represents a case where a full cone nozzle is used for the spray nozzles
  • the graph (L) represents a case where a hollow cone nozzle is used for the spray nozzles.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Nozzles (AREA)
EP13864088.3A 2012-12-19 2013-12-17 Exhaust gas processing apparatus Active EP2905062B1 (en)

Applications Claiming Priority (2)

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JP2012276654A JP5998915B2 (ja) 2012-12-19 2012-12-19 排ガス処理装置
PCT/JP2013/083755 WO2014098081A1 (ja) 2012-12-19 2013-12-17 排ガス処理装置

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JP (1) JP5998915B2 (ko)
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CN104602788A (zh) 2015-05-06
EP2905062A4 (en) 2015-08-19
DK2905062T3 (da) 2021-05-03
US9770690B2 (en) 2017-09-26
EP2905062A1 (en) 2015-08-12
WO2014098081A1 (ja) 2014-06-26
JP2014117685A (ja) 2014-06-30
KR101570466B1 (ko) 2015-11-20
KR20150038620A (ko) 2015-04-08
US20150174527A1 (en) 2015-06-25
JP5998915B2 (ja) 2016-09-28

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